'Weak entity types' diaporamas de présentation

Database Systems 02 Conceptual Design

Database Systems 02 Conceptual Design. Last update: Mar 11, 2019. Announcements/Org. Feedback so far #1 Video Recording (5): Record and upload lectures (English, repetition, flexibility, room) ? Expected start: Mar 18 #2 Questions (1): Repeat questions for everybody in the room

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526 views • 28 slides

Reflexive Rela 1 tionships

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The Relational Database Design

The Relational Database Design. ER- and EER-to-Relational Mapping. ER to Relational Mapping. Mapping of regular entity types Multivalued attributes Mapping of relationship Binary relationship N-ary relationship Mapping of weak entity types Mapping of specialization and generalization.

223 views • 14 slides

Entity, Attribute, and Relationship

Entity, Attribute, and Relationship. DATA ENTITY TYPE: a noun, i.e. roles, events, locations, people, tangible things about which we wish to maintain data ATTRIBUTE: noun, data elements that describe characteristics of the entity type

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E/R to relational mapping

278 views • 11 slides